US5281562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet absorbing glasses
Assignee: Corning Inc
•
Filing: 1992-11-25
•
Granted: 1994-01-25
•
Expires: 2012-11-25
Abstract
Abstract A non-photochromic R 2 O--B 2 O 3 --SiO 2 glass containing a cuprous or cuprous-cadmium halide crystal phase, having a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO 2 , 15-45% B 2 O 3 , 0-12% Al 2 O 3 , the Al 2 O 3 being less than 10% when the SiO 2 is over 55%, 0-12% Li 2 O, O-20% Na 2 O, 0-12% K 2 O, the Li 2 O+Na 2 O+K 2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu 2 O, 0-1% CdO, 0-5% ZrO 2 , 0-0.75% SnO 2 , 0-1% As 2 O 3 and/or Sb 2 O 3 , the glass containing 0-1.75% Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F by weight, and having an R-value, calculated in mole percent of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li 2 O, less than 10 cation % Al 2 O 3 , at least 0.3 cation % Cu 2 O and 0.50-2.0% Cl+Br. Also, a method of making the non-photochromic glass having a sharp spectral cutoff.
Inventors
- 👤 Roger J. Araujo
- 👤 David W. Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:35
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/085; C03C14/00; C03C14/006; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/11; C03C2214/00; C03C2214/16; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
211 words
A non-photochromic R 2 O--B 2 O 3 --SiO 2 glass which contains a precipitated cuprous or cuprous-cadmium halide crystal phase and has a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO 2 , 15-45% B 2 O 3 , 0-12% Al 2 O 3 , the Al 2 O 3 being less than 10% when the SiO 2 is over 55%, 0-12% Li 2 O, 0-20% Na 2 O, 0-12% K 2 O, the Li 2 O+Na 2 O+K 2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu 2 O, 0-1% CdO, 0-5% ZrO 2 , 0-0.75% SnO 2 , 0-1% As 2 O 3 and/or Sb 2 O 3 , the glass containing 0-1.75% Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F, the contents of Cl, Br, and F being in percent by weight of the total content of the glass composition, and having an R-value, calculated in mole percent, of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li 2 O, less than 10 cation % Al 2 O 3 , at least 0.3 cation % Cu 2 O and 0.50-2.0% Cl+Br.
Claim 2
Dependent Claim
211 words
A non-photochromic R 2 O--B 2 O 3 --SiO 2 glass which contains a precipitated cuprous or cuprous-cadmium halide crystal phase and has a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO 2 , 15-45% B 2 O 3 , 0-12% Al 2 O 3 , the Al 2 O 3 being less than 10% when the SiO 2 is over 55%, 0-12% Li 2 O, 0-20% Na 2 O, 0-12% K 2 O, the Li 2 O+Na 2 O+K 2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu 2 O, 0-1% CdO, 0-5% ZrO 2 , 0-0.75% SnO 2 , 0-1% As 2 O 3 and/or Sb 2 O 3 , the glass containing 0-1.75% Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F, the contents of Cl, Br, and F being in percent by weight of the total content of the glass composition, and having an R-value, calculated in mole percent, of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li 2 O, less than 10 cation % Al 2 O 3 , at least 0.3 cation % Cu 2 O and 0.50-2.0% Cl+Br.
Claim 3
Dependent Claim
26 words
A glass in accordance with claim 1 wherein the glass contains ZrO 2 , in an amount effective to increase the refractive index of the glass.
Claim 4
Dependent Claim
24 words
A glass in accordance with claim 1 wherein the glass contains CaO+BaO+SrO in an amount effective to increase the refractive index of the glass.
Claim 5
Dependent Claim
27 words
A glass in accordance with claim 1 wherein the glass contains Li 2 O in an amount effective to provide a sharp UV cutoff at 400 nm.
Claim 6
Dependent Claim
31 words
A glass in accordance with claim 1 wherein the glass contains 0.125-0.5 cation % Cu 2 O, the amount present being effective to provide a sharp UV cutoff at 400 nm.
Claim 7
Dependent Claim
28 words
A glass in accordance with claim 1 wherein the glass has an R-value less than that sufficient to inhibit precipitation of a cuprous chloride phase in the glass.
Claim 8
Dependent Claim
28 words
A glass in accordance with claim 1 wherein the glass contains 2-12% Al 2 O 3 , the amount present being insufficient to be deleterious to UV absorption.
Claim 9
Dependent Claim
17 words
A glass in accordance with claim 5 wherein the Cu 2 O content is 0.2-0.5 cation percent.
Claim 10
Dependent Claim
24 words
A glass in accordance with claim 1 wherein the content of Cl+Br is 0.5-1.5% by weigh of the total content of the glass composition.
Claim 11
Dependent Claim
81 words
A glass in accordance with claim 1 wherein the glass has no fixed tint and its composition consists essentially of 40-70% SiO 2 , 20-35% B 2 O 3 , 2-10% Al 2 O 3 , 8-20% R 2 O selected from 0-12% Li 2 O, O-20% Na 2 O and 0-12% K 2 O, 0.2-0.5% Cu 2 O and Cl and/or Br, the content of Cl and/or Br being 0.5-1.5% by weight of the total content of the glass composition.
Claim 12
Dependent Claim
25 words
A glass in accordance with claim 1 containing up to 1% of a transition metal oxide whereby a fixed tint is imparted to the glass.
Claim 13
Dependent Claim
63 words
A glass in accordance with claim 1 containing up to 2% of an oxide selected from the group consisting of TiO 2 , Nb 2 O 3 , and PbO, and/or up to 0.5% of an oxide selected from the group consisting of WO 3 and MoO 3 , whereby refractive index is enhanced and a fixed tint is imparted to the glass.
Claim 14
Dependent Claim
37 words
A glass in accordance with claim 1 wherein a portion of the copper content is in the cupric state, the amount of copper in the cupric state being sufficient to impart a fixed tint to the glass.
Claim 15
Dependent Claim
37 words
A glass in accordance with claim 1 wherein a portion of the copper content is in a colloidal state, the amount of copper in the colloidal state being sufficient to impart a fixed tint to the glass.
References Cited (Backward Citations)
US3325299A
Cited
US4166745A
Cited
US4222781A
Cited
US4550087A
Cited
US5024974A
Cited
US4980318A
Cited
EP0456351A2
Cited
US5145805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |